Effect of annealing and hydrogen plasma treatment on the luminescence of hydrothermally grown bulk ZnO

被引：11
|
作者：
Dangbegnon, J. K. [1 ]
Talla, K. [1 ]
Botha, J. R. [1 ]
机构：
[1] Nelson Mandela Metropolitan Univ, Dept Phys, Port Elizabeth, South Africa
来源：
OPTICAL MATERIALS | 2012年 / 34卷 / 05期
基金：
新加坡国家研究基金会;
关键词：
Bulk ZnO; Photoluminescence; Hydrogen plasma; Annealing; LIGHT-EMITTING-DIODES; ZINC-OXIDE; GREEN LUMINESCENCE; N-ZNO; COPPER; CRYSTALS;
D O I：
10.1016/j.optmat.2011.12.015
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The optical properties of hydrothermally grown bulk ZnO is investigated by low temperature photoluminescence (PL) spectroscopy. The effects of annealing in an argon atmosphere, as well as the influence of hydrogen plasma exposure, on the PL of as-grown material are studied. The 11 K PL spectrum of the, as-grown ZnO shows different excitonic lines in the NBE region: several bound exciton lines are clearly visible. The origin of these bound excitons is discussed, as well as the influence of annealing on these lines. A shift in the deep level emission (DLE) is also observed with an increase in annealing temperature: a red shift is detected when the annealing temperature is increased up to 650 degrees C, while a subsequent blue shift is observed upon an increase in the annealing temperature. The involvement of Li and Cu in this phenomenon will be discussed and the effect of hydrogen on this DLE will also be studied. Crown Copyright (c) 2011 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：920 / 925
页数：6
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